She packed an umbrella, lest it __________ during the outdoor event.

Complete Sentence: She packed an umbrella, lest it should rain during the outdoor event.

Lest এর ব্যবহার:
→ Lest একটি conjunction & এর অর্থ হল 'পাছে/যাতে না'। 
→ মূলত এটি negative অর্থে বাক্যে ব্যবহৃত হয়ে থাকে।

Structure: Independent clause + lest যুক্ত Dependent clause.
অর্থাৎ, subject + verb + other words + lest + subject + (should/might) + base form of verb + other words.

Example:
1. Jamil studied diligently lest he should fail the exam.
2. Sarah packed her bags early lest she should miss the train to the conference.
3. Jerin ran fast lest she should miss the class.
 
Source: Advanced Learner’s Grammar & Composition by Chowdhury & Hossain.